ctypeslib.py 文件源码

def load_library(libname, loader_path):
        if ctypes.__version__ < '1.0.1':
            import warnings
            warnings.warn("All features of ctypes interface may not work " \
                          "with ctypes < 1.0.1")

        ext = os.path.splitext(libname)[1]
        if not ext:
            # Try to load library with platform-specific name, otherwise
            # default to libname.[so|pyd].  Sometimes, these files are built
            # erroneously on non-linux platforms.
            from numpy.distutils.misc_util import get_shared_lib_extension
            so_ext = get_shared_lib_extension()
            libname_ext = [libname + so_ext]
            # mac, windows and linux >= py3.2 shared library and loadable
            # module have different extensions so try both
            so_ext2 = get_shared_lib_extension(is_python_ext=True)
            if not so_ext2 == so_ext:
                libname_ext.insert(0, libname + so_ext2)
        else:
            libname_ext = [libname]

        loader_path = os.path.abspath(loader_path)
        if not os.path.isdir(loader_path):
            libdir = os.path.dirname(loader_path)
        else:
            libdir = loader_path

        for ln in libname_ext:
            libpath = os.path.join(libdir, ln)
            if os.path.exists(libpath):
                try:
                    return ctypes.cdll[libpath]
                except OSError:
                    ## defective lib file
                    raise
        ## if no successful return in the libname_ext loop:
        raise OSError("no file with expected extension")